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Length-Tension Relationship
Sit-ups
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Muscles that produce flexion at the hip
Iliopsoas (Iliacus and Psoas major) Sartorius* Rectus femoris* Tensor fasciae latae* Pectinius (assists) *These muscles are two-joint muscles, also acting at the knee
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Iliopsoas: Iliacus and Psoas Major
Origin: Iliacus: Illium Psoas major: Lumbar vertebrae and sacrum Insertion: Lesser trochanter of the femur and just below Actions: Flexion at the hip External or lateral rotation at the hip
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Iliacus muscle
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Psoas major
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Sartorius Origin: Insertion: Actions: Anterior superior iliac spine
Anterior-medial aspect of the tibia Actions: Flexion at the hip External (lateral) rotation at the hip Flexion at the knee
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Rectus Femoris Origin: Insertion: Actions:
Anterior inferior iliac spine (ilium) Insertion: Patella, patellar tendon, tibial tuberosity Actions: Flexion at the hip Extension at the knee
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Rectus Femoris
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Tensor fascia latae Origin: Insertion: Actions: Iliac crest (Illium)
Iliotibial tract Actions: Flexion of the hip Abduction of the hip Slight internal rotation at the hip
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Tensor Fascia Latae
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Muscles of the abdomen Rectus abdominis External oblique
Internal oblique Transverse abdominis
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Rectus Abdominis: Actions:
Origin: pubis (pubic crest, symphysis pubis) Insertion: sternum and ribs (xiphoid process, cartilage) Actions: Both=flexion, compression Single= lateral flexion
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External Obliques: Origin: ribs (lower 8)
Insertion: Iliac crest, pubis, inguinal ligament, linea alba Actions: Both: flexion Single: lateral flexion, rotation
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External Oblique
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External oblique
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Internal Obliques: Origin: Iliac crest, inguinal ligament
Insertion: ribs, linea alba Actions: Both: flexion Single: lateral flexion, rotation
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Internal Oblique
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Internal oblique
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Transverse Abdominis:
Origin: Iliac crest, cartilage of ribs Insertion: Pubis, linea alba Action: Compression, forced expiration
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Transverse Abdominis
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Transverse abdominis
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